CN104297132B - A kind of experimental rig for testing multilayer geotextiles vertical permeability coefficient - Google Patents
A kind of experimental rig for testing multilayer geotextiles vertical permeability coefficient Download PDFInfo
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- CN104297132B CN104297132B CN201410623695.9A CN201410623695A CN104297132B CN 104297132 B CN104297132 B CN 104297132B CN 201410623695 A CN201410623695 A CN 201410623695A CN 104297132 B CN104297132 B CN 104297132B
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Abstract
The invention discloses a kind of experimental rig for testing multilayer geotextiles vertical permeability coefficient, including water inlet pipe, water storage graduated cylinder a, seepage flow room, water storage graduated cylinder b and communicating pipe, water inlet pipe is connected with water storage graduated cylinder a tops, water storage graduated cylinder a tops are provided with steam vent a, water storage graduated cylinder b tops are provided with osculum, seepage flow room lower sidewall with water storage graduated cylinder b bottoms by connecting communicating pipe, the device also includes sealing device, water storage graduated cylinder a bottoms are fixedly connected with sealing device top, and the top of seepage flow room is fixedly connected with sealing device bottom；It is close to place multiple annular shape geotextiles stands successively in seepage flow room, the upper and lower part of geotextiles stand is fixed with geotextiles；The side wall upper part of water storage graduated cylinder a is provided with spout hole, inner wall lower and is provided with thermometer, outer wall and is provided with master scale.The present invention can carry out vertical permeability coefficient test to single or multiple lift geotextiles according to the experiment suitable head difference of geotextiles type adjustment, and measuring accuracy is high, simple to operate, resistance to overturning is good.
Description
Technical field
Instrument the present invention relates to test Hydraulie Conductivity of Geotetile, particularly a kind of test multilayer geotextiles are vertically permeated
The experimental rig of coefficient.
Background technology
Using Transverse permeability test device to geotextiles and its article（Pass through acupuncture or braiding by synthetic fibers
The different geosynthetics of water penetration, such as Woven geofabric, non-woven geotextile, braided geotextile, composite earthwork cloth
Deng）Water permeability tested, be isolation of the other geotextiles of study of various in engineer applied, anti-filter, drainage, anti-
A kind of important means of shield property and sealing etc., to determine its engineering adaptability, accomplishes to save material, reduces investment and to original
Effective utilization of material.
Existing geotextiles Transverse permeability test device is mainly used in test individual layer geotextiles and is acted in fix-head difference
Under Penetration Signature, and in Practical Project for strengthen geotextiles isolation or protection effect, often used using multilayer build-up, its
Infiltration coefficient can not be simply by individual layer geotextiles vertical permeability coefficient accumulation calculating, and infiltration coefficient test is inaccurate will be very big
Ground influence practical application effect, or even harm engineering safety.The multilayer geotextiles that such as lining cutting is used behind in Tunnel Engineering, if oozing
Saturating coefficient test is inaccurate will to cause that its laying is unreasonable, and lining cutting is born excessive external water pressure and causes potential safety hazard.In addition,
In the case where head difference is constant, the resultant error for the test of same geotextiles is big, and geotextiles such as weak to permeability are entered
Row test, is differed greatly using the infiltration coefficient obtained by two kinds of different head differences of 100mm and 500mm, and it is main reason is that water
Pressure is on chemosmotic influence, in order that test result is accurately credible, using various head differences need to test and analyze data.
So that designing such a device, realization that can be convenient, flexible is carried out to multilayer geotextiles under the effect of different head differences
Vertical permeability coefficient is tested.
Chinese patent ZL200620045573.7 discloses a kind of Vertical permeameter.Vertical permeameter is by oozing described in the patent
Saturating room, pressue device, outlet pipe, geotextiles fixed mount etc. are constituted, and intake chamber is connected with pressue device, and water-supplying chamber connects with outlet pipe
It is logical, set by pressue device, make the pressure difference formed between intake chamber and water-supplying chamber constant, then the geotextiles that need to be tested are consolidated
It is scheduled on the geotextiles fixed mount between intake chamber and water-supplying chamber and is tested, the water flowed out by measuring outlet pipe is conversed
The water penetration of geotextiles.
Above-mentioned existing Vertical permeameter there are following deficiency：
1st, experiment can only carry out vertical permeability coefficient test to individual layer geotextiles --- and experiment is broken ground by weights weight band
Briquetting above work cloth fixed mount is fixed to geotextiles, but for multilayer geotextiles, only each layer keeps closely connected smooth
When its measurement data could be accurate, greater weight weights need to be used, and consider the obvious nothing of bearing capacity and stability of instrument
Method meets requirement.
2nd, experiment can not ignore the border infiltration effect of infiltration room, will have a strong impact on result of the test --- and the instrument is oozed
Thoroughly during experiment, because geotextiles have certain water preventing ability, water enters behind infiltration room easily from geotextiles edge and infiltration room side wall
Between space outflow, and by test requirements document percolation path perpendicular through geotextiles so that outlet pipe outflow water it is bigger than normal,
The geotextiles infiltration coefficient distortion for conversing.
3rd, infiltration room lower section is tested differential water pressures and is difficult to stabilization without vent valve --- and the instrument is carried out in process of the test, needs to protect
The pressure difference formed between card intake chamber and water-supplying chamber is constant, but drives the water that briquetting fixes geotextiles and intake chamber to flow into weights
During infiltration room, easily forming bubble cannot exclude, and pressure difference is difficult to constant, the reliability of influence result of the test in causing process of the test.
4th, head difference cannot change influence precision --- and the influence due to hydraulic pressure to permeability test is larger, and permeance property is different
Geotextiles need to be tested using different head differences, and instrument head difference in process of the test cannot be adjusted, experiment knot
Fruit error is big.
The content of the invention
Defect the invention aims to overcome existing geotextiles Vertical permeameter, there is provided one kind test multilayer geotextiles
The experimental rig of vertical permeability coefficient, can convenient, fast, exactly test the infiltration coefficient of single or multiple lift geotextiles, and
Permeance property according to geotextiles selects suitable head difference to be tested to obtain relatively reliable result of the test, reduces hydraulic pressure
The influence of effect and border infiltration effect to test accuracy.
To reach above-mentioned purpose, the present invention is implemented according to following technical scheme：
It is a kind of test multilayer geotextiles vertical permeability coefficient experimental rig, including water inlet pipe, water storage graduated cylinder a, seepage flow room,
Water storage graduated cylinder b and communicating pipe, water inlet pipe one end connection water source, the other end and the connection of water storage graduated cylinder a tops, water storage graduated cylinder a
Top is provided with steam vent a, and water storage graduated cylinder b tops are provided with osculum, and seepage flow room lower sidewall is by communicating pipe and water storage graduated cylinder b bottoms
Portion connects, and the device also includes sealing device, and described water storage graduated cylinder a bottoms are fixedly connected with sealing device top, seepage flow room
Top be fixedly connected with sealing device bottom；It is close to place multiple identical annular shape geotextiles platforms successively in the seepage flow room
Frame, the upper and lower part of geotextiles stand is fixed with geotextiles；The side wall upper part of the water storage graduated cylinder a is provided with spout hole, inner wall lower
It is provided with thermometer, outer wall and is provided with master scale.
Further, water storage graduated cylinder a sides wall is fixed with head difference controller, is evenly arranged in head difference controller many
Individual chute, water storage graduated cylinder b outer walls top is contour with osculum and has been arranged symmetrically interior sliding assembly, and interior sliding assembly may be in sliding
Slided in groove and fixed.
Further, seepage flow room upper and lower part is respectively equipped with steam vent b and steam vent c.
Preferably, the water inlet pipe is provided with water adjusting valve.
Specifically, the sealing device bottom is arranged in the top of seepage flow room, the bottom of sealing device and the soil of the top
The upper surface of work cloth stand offsets, and sealing device top outer rim and seepage flow room top outer rim are equipped with wing plate, the wing of sealing device
The wing plate of plate and seepage flow room passes through four groups of bolt connections being arranged symmetrically, and sealing device bottom outer wall is provided with two ring rubber to be stopped
A ring rubber water-proof circle b is provided between the upper surface of the geotextiles stand of hydrosphere a, bottom and the top.
Used as present invention further optimization scheme, described each geotextiles stand upper and lower part and side wall are equipped with rubber
The draw-in groove of sealing collar, is provided with rubber water-proof circle b, in the draw-in groove of geotextiles stand side wall in the draw-in groove of geotextiles stand upper and lower portion
It is provided with rubber water-proof circle a.
Compared with prior art, beneficial effects of the present invention：
1st, because the present invention is provided with 10 geotextiles stands in seepage flow room, can be according to experiment demand, to individual layer or many
Layer geotextiles carry out vertical permeability coefficient test, when testing multilayer geotextiles, can be using different materials and the geotextiles of model
Tested, tested its composite permeability coefficient, expanded the scope of application of the present apparatus；
2nd, the present invention is at sealing device and seepage flow room connection gap, between geotextiles stand and the wall of geotextiles stand side
With rubber water-proof circle is provided with the gap between seepage flow chamber interior walls, enhance the hermetic seal effect of experimental rig, change speech
It, also ensure that the correct percolation path of experiment, so avoid influence of the border infiltration effect to result of the test；
3rd, the present invention is provided with head difference controller and interior sliding assembly, can be suitable according to experiment geotextiles type adjustment
Head difference Δ H, it is ensured that the reasonability of experiment, meanwhile, in same battery of tests, surveyed using multigroup test head difference
Try and analysis result, this ensures that there the accuracy of permeability test result；
4th, rational position of the present invention in water storage graduated cylinder and seepage flow room is provided with steam vent, can install geotextiles stand
The discharges such as the bubble produced in journey, the air gap between the bubble of geotextiles compacting out-of-flatness generation and multilayer geotextiles, subtract
Influence of the small air pressure to water flow；
5th, the present invention is being tested using the thermometer for being placed in water storage graduated cylinder inwall and the master scale of moisture storage capacity drum outer wall
In easily and accurately read experiment water temperature and head difference, it is ensured that test accuracy and reliability；
6th, it is many present invention can apply to Tunnel Engineering, foundation engineering, road engineering, slope project, landscape engineering etc.
Individual engineering field, remarkable in economical benefits.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention
Fig. 2 is the sectional view of the embodiment of the present invention；
Fig. 3 is the sealing system and seepage flow room junction structural representation of the embodiment of the present invention；
Fig. 4 is the geotextiles horse structure schematic diagram of the embodiment of the present invention；
Fig. 5 is the head difference controller and water storage graduated cylinder b junctions structural representation of the embodiment of the present invention.
Specific embodiment
With reference to specific embodiment, the invention will be further described, the illustrative examples invented herein and explanation
It is for explaining the present invention but not as a limitation of the invention.
A kind of experimental rig of test multilayer geotextiles vertical permeability coefficient as shown in Figure 1, Figure 2, Figure 5, including water inlet
Pipe 2, water storage graduated cylinder a5, seepage flow room 14, water storage graduated cylinder b9 and communicating pipe 12, the one end of water inlet pipe 2 connection water source, the other end and water storage
Graduated cylinder a5 tops connect, and external water source is constant water source without interruption, and water inlet pipe 2 is provided with water adjusting valve 3, water storage graduated cylinder a5 tops
Portion is provided with steam vent a1, and water storage graduated cylinder b9 tops are provided with osculum 8, and the lower sidewall of seepage flow room 14 passes through communicating pipe 12 and moisture storage capacity
Cylinder b9 bottoms connection, the device also includes sealing device 17, and water storage graduated cylinder a5 bottoms are fixedly connected with the top of sealing device 17, ooze
The top of flow chamber 14 is fixedly connected with the bottom of sealing device 17；It is close to place the circular soil of 10 identicals successively in seepage flow room 14
Work cloth stand 21, the upper and lower part of geotextiles stand 21 is fixed with geotextiles 20；The side wall upper part of water storage graduated cylinder a5 is provided with spout hole
4th, inner wall lower is provided with thermometer 16, outer wall and is provided with master scale 7.Water storage graduated cylinder a5 sides wall is fixed with head difference controller 6, water
Multiple chutes 10 are evenly arranged in head difference controller 6, water storage graduated cylinder b9 outer walls top is contour with osculum 8 and has been arranged symmetrically interior
Sliding assembly 22, interior sliding assembly 22 may be in being slided in chute 10 and fixed, and water storage graduated cylinder a5 effects are to collect and store
Water, it is to avoid the geotextiles 20 that water is directly impacted in seepage flow room 14 form larger kinetic head, so as to influence the standard of result of the test
True property, between spout hole 4 and osculum 8（That is to say between the zero graduation line of master scale 7 and interior sliding assembly 22）It is vertical
Height difference is test head difference Δ H, the overflow runoff investigation water adjusting valve 3 according to spout hole in process of the test 4, so as to control examination
Inflow is tested, as long as spout hole 4 has stable overflow in experiment, you can it is determined that stabilization head has been formed, water storage graduated cylinder a5 inwalls
Thermometer 16 is provided with, experiment water temperature can be conveniently read, it is ensured that test accuracy and reliability, water storage graduated cylinder a5 outer walls are provided with standard
Scale 7, the zero graduation line of master scale 7 is centrally located in same horizontal line with spout hole 4, and its scale value is from top to bottom successively
Increase, water storage graduated cylinder a5 tops are provided with steam vent a1, it is ensured that the inside and outside air pressure of water storage graduated cylinder a5 is equal in process of the test, by surveying
The water of the discharge of amount water storage graduated cylinder b9 tops osculum 8 can calculate geotextiles vertical permeability coefficient.
Further, as shown in Figure 1, 2, the upper and lower part of seepage flow room 14 is respectively equipped with steam vent b13 and steam vent c15,
The bubble produced in the installation process of geotextiles stand 21, geotextiles 20 can be compacted the bubble and multilayer geotextiles of out-of-flatness generation
The air gap between 20 etc. is discharged, and reduces influence of the air pressure to water flow.
Further, as shown in figure 3, the bottom of sealing device 17 is arranged in the top of seepage flow room 14, sealing device 17
Bottom offsets with the upper surface of the geotextiles stand 21 of the top, and the top outer rim of sealing device 17 and the top outer rim of seepage flow room 14 are equal
Wing plate is provided with, four groups of bolts 11 that the wing plate of sealing device 17 and the wing plate of seepage flow room 14 pass through to be arranged symmetrically are connected, sealing dress
Put between 17 bottom outer walls are provided with the upper surface of the geotextiles stand 21 of two ring rubber water-proof circle a18, bottom and the top and be provided with
One ring rubber water-proof circle b19, to ensure that water does not flow out from the connection gap of sealing system Yu seepage flow room 14, the wing plate of sealing device 17
Four groups of bolts 11 for passing through to be arranged symmetrically with the wing plate of seepage flow room 14 are connected, and the connection of bolt 11 is easy to exchange the geotechnique in seepage flow room 14 for
Cloth 20.
Specifically, as in Fig. 4, each upper and lower part of geotextiles stand 21 and side wall are equipped with the draw-in groove 23 of rubber water-proof circle,
Rubber water-proof circle b19 is provided with the draw-in groove 23 of the upper and lower portion of geotextiles stand 21, is set in the draw-in groove 23 of the side wall of geotextiles stand 21
There is rubber water-proof circle a18.The upper and lower part of geotextiles stand 21 can place single or multiple lift geotextiles 20 according to experiment demand, utilize
Rubber water-proof circle b19 connects draw-in groove 23, you can make the edge of geotextiles 20 closely connected with geotextiles stand 21, rubber water-proof circle b19 was both
Geotextiles 20 can be fixed, while experiment reclaimed water transverse direction crossfire is also prevented from, to ensure the accuracy of percolation path.Geotextiles stand 21
Placement rubber water-proof circle a18 in the draw-in groove 23 of side wall, prevents experiment reclaimed water in the side wall of geotextiles stand 21 and the inwall of seepage flow room 14
Between gap flowing.
Technical scheme is not limited to the limitation of above-mentioned specific embodiment, and every technology according to the present invention scheme is done
The technology deformation for going out, each falls within protection scope of the present invention.
Claims (4)
1. a kind of experimental rig for testing multilayer geotextiles vertical permeability coefficient, including water inlet pipe（2）, water storage graduated cylinder a（5）, ooze
Flow chamber（14）, water storage graduated cylinder b（9）And communicating pipe（12）, the water inlet pipe（2）One end connection water source, the other end and water storage graduated cylinder a
（5）Top connects, water storage graduated cylinder a（5）Top is provided with steam vent a（1）, water storage graduated cylinder b（9）Top is provided with osculum（8）, seepage flow
Room（14）Lower sidewall passes through communicating pipe（12）With water storage graduated cylinder b（9）Bottom connects, it is characterised in that：The device also includes close
Seal apparatus（17）, described water storage graduated cylinder a（5）Bottom and sealing device（17）Top is fixedly connected, seepage flow room（14）Top
With sealing device（17）Bottom is fixedly connected；The seepage flow room（14）Inside it is close to place multiple identical annular shape geotextiles successively
Stand（21）, geotextiles stand（21）Upper and lower part be fixed with geotextiles（20）；The water storage graduated cylinder a（5）Side wall upper part set
There is spout hole（4）, inner wall lower be provided with thermometer（16）, outer wall be provided with master scale（7）, the water storage graduated cylinder a（5）Side wall is consolidated
Surely there is head difference controller（6）, head difference controller（6）Inside it is evenly arranged multiple chutes（10）, water storage graduated cylinder b（9）On outer wall
Portion and osculum（8）It is contour and be arranged symmetrically interior sliding assembly（22）, interior sliding assembly（22）Can be in chute（10）Interior slip
And fixation, the seepage flow room（14）Upper and lower part is respectively equipped with steam vent b（13）With steam vent c（15）.
2. it is according to claim 1 test multilayer geotextiles vertical permeability coefficient experimental rig, it is characterised in that：It is described
Water inlet pipe（2）It is provided with water adjusting valve（3）.
3. it is according to claim 1 test multilayer geotextiles vertical permeability coefficient experimental rig, it is characterised in that：It is described
Sealing device（17）Bottom is arranged on seepage flow room（14）In top, sealing device（17）Bottom and the top geotextiles stand
（21）Upper surface offset, sealing device（17）Top outer rim and seepage flow room（14）Top outer rim is equipped with wing plate, sealing device
（17）Wing plate and seepage flow room（14）Wing plate pass through four groups of bolts being arranged symmetrically（11）Connection, the sealing device（17）Under
Portion's outer wall is provided with two ring rubber water-proof circle a（18）, bottom and the top geotextiles stand（21）Upper surface between be provided with one
Ring rubber water-proof circle b（19）.
4. the experimental rig of the test multilayer geotextiles vertical permeability coefficient according to claim 1 or 3, it is characterised in that：
Described each geotextiles stand（21）Upper and lower part and side wall are equipped with the draw-in groove of rubber water-proof circle（23）, geotextiles stand（21）
The draw-in groove of upper and lower portion（23）Inside it is provided with rubber water-proof circle b（19）, geotextiles stand（21）The draw-in groove of side wall（23）Inside it is provided with rubber
Glue sealing collar a（18）.
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| CN107255612A (en) * | 2017-06-29 | 2017-10-17 | 河北天辰仪器设备有限公司 | Geotextiles infiltrometer |
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| CN108489791B (en) * | 2018-06-20 | 2024-02-13 | 三峡大学 | Automatic separation device for water and gas in pipeline and use method |
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